Nitro-blue tetrazolium polyvinyl butyral film dosimeters (NBT-PVB) were prepared and investigated based on radiation-induced reduction of NBT. NBT-PVB film dosimeters containing different concentrations of NBT dye from 1 to 5 mM were prepared in a solution of ethanol. The dosimeters were irradiated with g-ray from Co source at doses from 5 up to 55 kGy. UV/vis spectrophotometry was used to inve...

This work investigated the suitability of passive dosimeters for reference dosimetry in small fields with acceptable accuracy. Absorbed dose to water rate was determined in nine small radiation fields with diameters between 4 and 35 mm in a Leksell Gamma Knife (LGK) and a modified linear accelerator (linac) for stereotactic radiosurgery treatments. Measurements were made using Gafchromic film (...

Changes in the linear attenuation coefficient of polymer gel dosimeters post-irradiation enable the imaging of dose distributions by x-ray computed tomography (CT). Various compositions of polymer gel dosimeters manufactured from acrylamide (AA), and N,N'-methylene-bis-acrylamide (BIS) comonomers and gelatin or agarose gelling agents were investigated. This work shows that increasing the comono...

Active and passive dosimetry instrumentation to measure absorbed dose, charged particle spectra, and linear energy transfer spectra inside the command module and orbital workshop on the NASA Skylab Program in 1972 have been developed and tested. The active doslmetry system consists of one integral unit employing both a tissue equivalent ionization chamber and silicon solld state detectors. The ...

Marathon runners spend considerable time in outdoor training for and participating in marathons. Outdoor runners may experience high solar ultraviolet radiation (UVR) exposure. South Africa, where running is popular, experiences high ambient solar UVR levels that may be associated with adverse health effects. This feasibility study explores the use of personal dosimeters to determine solar UVR ...

The purpose of this study was to evaluate dependence of MAGICA polymer gel dosimeter 1/T2 on different electron energies as well as on different mean dose rates for a standard clinically used Linear accelerator. A calibration curve (in the linear region) based on 12 dosimeters (11 irradiated and one background) was obtained for 6MeV electron beam. Dose rate of dependence was studied in 10MeV el...

Radiation plays a very important role in the life of humans. Measurements radiation technologies and processes are important. Usually measurements made with dosimeters various types: solid state dosimeters, liquid gaseous dosimeters. Dose based on different principles: temperature increase, collection electric charge, development gases, accumulation free radicals, trapping electron matrix, colo...